• The first successful attempt at a Revision Control System.

• For a resource file filename there is a control file s.filename which contains system data (version and revision history - including details of changes made).

• Only one user may change a given document at any given time.

• NO BINARY FiLES.

Basic commands:

• admin: Create new control files and modify parameters of existing ones
• delta: Check changes made to controlled file into its control file
• get: Obtain either an editable or read-only version of a controlled file
• prs: Print some (or all) of the contents of a control file
• rmdel: Remove a "delta" (i.e., a change) from a control file
• sact: Show current editing activity on a controlled file
• unget: Cancel the edit of a controlled file
• val: Validate a control file
• what: Indentify a controlled file